Is in that a creative method to do a tub surround to some extent than tile or plastic, close to could you use painted composite or red-guarded and painted concrete board or, well something else that wouldn't...

or red-guarded and painted concrete board or, well something else that wouldn't rot?

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Answers:    the concrete board would have such deficient edges... you could get a mirror cut to the size you want (at least 4" high) near beveled edges, and glue it to the wall. that would be different.

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